The Oxidation Products from Two Kinds of Tocopherols Co-Existing in Autoxidation System of Methyl Linoleate

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概要

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• The oxidation products of both types of mixtures of α- tocopherol (α-Toc) and Ttocopherol (γ-Toc) or α-Toc and δ-tocopherol (δ-Toc) during autoxidation of methyl linoleate were isolated and iden-tified. The structures of the oxidation products were characterized by UV, IR, 1H and 13C NMR, and mass spectrometry. The 5-[2-(α-tocopherol-5'-yl)ethyl]-a-tocopherylquinone, 5-[2-(α-tocopherol-5'-yl)ethyl]-8a-hy-droxy-α-tocopherone, and O-[8-(5-ethoxymethyl-7-methyltocol)methyl]-α-tocopherol were obtained from both types of the mixtures as the oxida-tion products derived from α-Toc. γ-Toc diphenyl ether dimer (γ-TED) and γ-Toc biphenyl dimer (γ-TBD) were identified from the mixture of α-Toc and y Toc, and δ-Toc diphenyl ether dimer (δTED) from the mixture of α-Toc and δ-Toc. However, no oxidation product composed of both α-Toc and γ-Toc or δ-Toc was detected in oxidation products of both types of the mixtures. These results support the facts that, at first, oxidation of α-Toc proceeds during autoxidation of lipids and then γ-Toc or δ-Toc decomposes after approximate consumption of α-Toc.

著者

• 五十嵐 脩

  Institute of Environmenal Science for Human Life, Ochanomizu University

• 河 貴現

  Institute of Environmental Science for Human Life, Ochanomizu University

関連論文

• Metabolism of .GAMMA.-linolenic acid in primary cultures of rat hepatocytes and in Hep G2 cells.
• The Oxidation Products from Two Kinds of Tocopherols Co-Existing in Autoxidation System of Methyl Linoleate
• Effect of dietary protein on vitamin E levels in erythrocytes and tissues of rats.
• The influence of marine oil intake upon levels of lipids, .ALPHA.-tocopherol and lipid peroxidation in serum and liver of rats.

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